JPH07105892B2 - Data communication device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a data communication device for transmitting and receiving data.

[Prior art]

Conventionally, this type of device, for example a faxcimili device,
Even when there are two or more same images in the original of the page, there is a drawback in that the entire original is read and scanned and the read data is encoded and sent, so that the data amount increases and transmission time is required.

〔Purpose〕

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data communication device which eliminates the above-mentioned drawbacks of the conventional example and can reduce the amount of data and the transmission time.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a perspective view showing the above embodiment.

The reader 10 reads a predetermined document and outputs an electric signal.

The main body 20 of the facsimile is a reader / printer interface 21 and an image compression unit (hereinafter referred to as "IC").
22), program memory (hereinafter “PMEM”) 23, bit move unit (hereinafter “BMU”) 24, image memory (hereinafter “IMEM”) 25
A video RAM (hereinafter referred to as "VRAM") 26, a central processing unit (hereinafter referred to as "CPU") 27, a communication interface 28, a bus 29, and a communication unit control unit (hereinafter referred to as "CCU"). That is) 30 and.

The ICU 22 compresses or decompresses data, and two-dimensional compression (high compression) is used to reduce the coding rate. The PMEM23 has an OS program and an application program memory area for controlling the input / output devices provided around the main unit 20 and each unit in the main unit, and also converts the character code into image data. A font memory area for the purpose.

In addition, PMEM23 is a memory management unit (MMEU)
It also has a work area as a buffer for transmission data to be transmitted from the hard disk via the CCU 30 and stored from the CCU 30 to the hard disk. It should be noted that the buffer is for speed adjustment of the disk, line, etc.

The BMU 24 edits an image (image processing) in the CRT 60, and enlarges, reduces, rotates, moves, or cuts a predetermined image.

The IMEM25 has 4 bytes and stores the image from the reader, the edited image by the BMU24, the data expanded by the ICU22, the word processor code data by the key code charactor, the mixed data or the key data. It stores the data obtained by converting the lacta code into an image. Here, in the case of mixed data, the image block and the confirmation block are stored with an identification code. The IMEM 25 is for temporarily storing predetermined data to match the speed of the reader 10 and the line 40, and the VRAM 26 is for storing image data to be displayed on the CRT 60 and a bit map code.

Further, a hard disk device 50 and a floppy disk device 51 are provided as external storage devices. Although these devices are non-volatile memories, back-up memory may be used as the non-volatile memory.

The keyboard 61 is for inputting characters and the like, and for specifying a position on the CRT 60 using a cursor. Mouse 6
2 is one of pointing devices. In addition, a printer 70 is provided.

In the mix mode terminal of this embodiment, image data, character data, and data in which image and character data are mixed can be communicated.

First, in the case of transmission, for example, the transmission original is divided into a plurality of blocks (image data or character data may be divided into a plurality of blocks) such as an image area and a character area, and the position information and the size of each block are stored. Packets are exchanged between receiving devices in units of blocks by adding information such as information to a code.

3 (a), (b), (c), and (d) are diagrams showing the data structure according to the present embodiment.

The details will be described below with reference to FIGS. 3 (a), (b), (c), and (d).

FIG. 3 (a) is a diagram showing the overall structure of data.

A in FIG. 3A is transmission information data such as the name of the transmission source, the transmission date and time, and the number of originals. B is page data,
The page data B is an identification code indicating whether all the original data of one page is charactor data, all the image data, or mixed data of image data and charactor data, and the original data of one page. Is composed of some block data.

C is a code indicating that the block data continues thereafter.

D and E are block data, respectively.

The transmission information data A, page data B, and block data instruction code C are added by the device on the transmission side.

FIG. 3B is a diagram showing the data structure of the block data when the block data is image data.

In FIG. 3B, a is block address information.

b is block size information.

c is information indicating that the data of this block is image data.

d is information indicating the type of image data encoding. For example, the image data of this block is MH, MR, MM.
It shows which encoding method of R is used for encoding. However, the encoding method is not limited to the above three.

e is information indicating the scanning density of the image data in the sub-scanning direction.

f is image data.

FIG. 3 (c) is a diagram showing the data structure of the block when the block data is charactor data.

In FIG. 3 (c), c'is information indicating that this block data is charactor data.

d'is information indicating the expression of the charactor, for example, the size information of the charactor, the arrangement direction of the charactor, and the like.

FIG. 3 (d) is a diagram showing the data structure of the block when the block data is the same as the other block data.

In FIG. 3 (d), h is information indicating that the data of this block is the same as the other block data.

i is address information of the other block data.

First, the creation of the data shown in FIG. 3A will be described.

The operator edits the image data read by the radar 10 and the character data input by the keyboard 61 while viewing the image of the CRT 60.

The operator divides the one-page original data into a plurality of blocks while looking at the one-page original displayed on the CRT 60. At that time, the block address and the block size are determined.

The operator inputs the address and size of each block by using the mouse 62 and the keyboard 61, and then, as shown in FIG.
The address information α and the size information b shown in (c) and (d) are added to the block character data and the image data.

The image data read by the reader 10 is
Although encoded by the ICU 22, information d indicating this encoding method (MMR encoding is performed in this embodiment) and information e indicating the scanning density of the image data in the sub-scanning direction are also added.

On the other hand, the characteristic information d'of the charactor is included in the charactor data.
Has been added.

Further, information c'indicating that the data is charactor data is added to the charactor data and the image data.

When the data of the block is the same as the data of the other blocks, the operator inputs the address of the other block which is the same data by the keyboard 61. As a result, the same data block address information i and the information h shown in FIG. 3 (d) indicating the same data are added.

All the above-mentioned addition of each information is performed by the CPU 27, and one-page original data is created in this way and stored in the hard disk device 50.

When transmitting, the operator operates the keyboard 61 and causes the CPU 27 to read the transmitted document data from the hard disk device 50. The transmission source information data A and page data B shown in FIG. 3 (a) are input by the keyboard 61 and added to the data to be transmitted.

In this way, the transmission data of FIG. 3 (a) is created, and the CCU30
Is transmitted to the receiving device via.

Next, reception will be described.

The data received via the circuit 40 and the CCU 30 is first stored in the hard disk device 50. CRT60 when receiving data
Is displayed on the screen.

To display received data on the CRT60, or printer 7
When printing out with 0, the operator designates document data with the keyboard 61 and performs display or printout execution input. This allows CPU27
Reads out specified document data from the hard disk device 50. Then, the data shown in FIG. 3A is expanded into dot data and stored in the IMEM 25.

FIG. 4 is a view showing document dot data stored in the memory for one page of IMEM25.

In the case of FIG. 4, one page is divided into six blocks. The source information A (code information) added to the data is expanded into font data corresponding to each code.

Next, the block data is expanded. First, the position and size of the block on the memory are determined by the address α and the size information b, and the image data or the dot data of the character data is stored in the memory area of the block.

CPU27 is the data identification information C, C'added to the block.
It is determined whether the block data is image data or character data by. In the case of image data, the image data coded by the ICU 22 is decoded based on the coded information d and the pixel density data e, and the dot data is stored in the block area of the IMEM 25. If the block data is charactor data, the charactor is expanded based on the font data stored in the PMEM23 based on the expression information d'of the charactor, and the dot data is stored in the block area of the IMEM25. To do.

If the block data is the data shown in FIG. 3 (d),
The CPU 27 reads the image data or character data of the block of the same data based on the same data block address i, so that the same image or dot data of the character as other same data block is stored in the block area of the IMEM25. become.

The reading of the block data in FIG. 3D will be described in detail.

When the CPU 27 reads the block data of FIG. 3 (d) from the hard disk device 50, it first determines the block area of the page memory of the IMEM 25 based on the address information α and the size information b as described above. The size information b is expressed by the number of bits in the vertical direction and the horizontal direction. As shown in FIG. 4, the address α and the size information X (the number of bits in the horizontal direction) and Y (the number of bits in the vertical direction) are used. The block area is determined by the number of bits.

Next, when the CPU 27 identifies the information b indicating that it is the same data as the other block data, it inputs the same data block address information i. Then, the size information X ', Y'of the same data block is read out based on the same data block address information i and compared with the above X, Y. At the same time, the CPU 27 determines whether the data of the same data block is image data or charactor data.

If the data of the same data block is image data
The CPU 27 reads the dot data with the same data block information of the IMEM 25, scales the read dot image data according to the ratio of the X, Y and the X ', Y', and stores it in the block area of the IMEM 25. The scaling of the dot image data is usually performed by a well-known scaling method.

As described above, the same image data is stored in IMEM25.

Further, if the data contents are the same, it is possible to automatically change the magnification according to the block size information.

Also, when the data of the same data block is charactor data, as in the case of the image data described above, IMEM
The dot charactor data in the same data block area is read from 25 and the scaling processing is performed based on the block size information b and stored in the block area of the IMEM 25.

In the case of charactor data, charactor data of the same data block may be read from the hard disk device 50 and expanded by the font data of the PMEM23 according to the block size information b. A beautiful image can be obtained.

In this way, dot data as shown in FIG. 4 is stored in the page memory of IMEM25.

In FIG. 4, block 4 is the scaled data of the image data of block 1, and block 6 is the scaled data of the dot charactor data of block 2. Block 3 is the dot character data and block 5 is the dot image data.

When displaying data on the CTR 60, the display data is read from the IMEM 25 and stored in the VRAM 26 for display. When printing out, the data is read from the IMEM 25 and output to the printer 70 for printing.

As described above, when the image data or the character data is the same as the data of other blocks, it is sufficient to add the address information i of the same data block to the block, so that the data amount can be reduced and the transmission. The time can be shortened.

Further, as described above, the magnification can be automatically changed according to the block size information b.

Further, in this embodiment, the image data or the character data of the same data block in one page is used.
By adding page information to the same data block address information i in FIG. 3 (d), image data or character data of blocks on other pages can be used.

FIG. 5 is a flow chart in this embodiment, and the mix mode terminal of this embodiment performs the above-described operation along the flow chart in FIG.

〔effect〕

As described above, according to the present invention, it is possible to reduce the amount of data in the data communication device, save the memory and reduce the transmission time.

[Brief description of drawings]

FIG. 1 is a block diagram showing the basic structure of one embodiment of the present invention, FIG. 2 is a perspective view of this embodiment, and FIGS. 3 (a), (b), (c), and (d) are books. FIG. 4 is a diagram showing a data structure of the embodiment, and FIG. 4 is a diagram showing a page memory of the IMEM25. FIG. 5 is a flow chart of this embodiment. 10 is a reader, 20 is a fax machine main body, 21 is a reader / printer interface, 22 is ICV, 23 is PMEM, 24 is BMU,
25 is IMEM, 26 is VRAM, 27 is CPU, 28 is communication interface, 29 is bus, 30 is CCU, 40 is communication line, 50 is hard disk device, 51 is floppy disk device, 60 is CRT, 61 Is a keyboard, 62 is a mouse, and 70 is a printer.

Claims (2)

[Claims] 1. A unit for dividing data into a plurality of blocks each having an arbitrary size and adding information indicating the size of each block, and at least two or more data having the same content in each block data of the plurality of blocks. When present, means for assigning a predetermined code indicating that the latter block data having the same content has the same content as the previous block data, and a plurality of blocks including the block to which the predetermined code is assigned. Data communication characterized by having a transmitting means for transmitting, and reducing the amount of data transmitted by transmitting the predetermined code by omitting transmission of the block data of the same content to which the predetermined code is assigned. apparatus. 2. Receiving means for receiving data which is divided into a plurality of blocks and to which information indicating the size of each block is added, and each block data received according to the size information of each block is reproduced, The data communication device according to claim 1, further comprising a reproducing means for reproducing data having the same content as that of the block corresponding to the predetermined code, to the block to which the predetermined code is assigned.